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Nanostructured LaFeO3 and substituted La1-xEuxFeO3 (x =0.1,0.15,and 0.2) perovskites were synthesized by sol-gel auto-combustion and their activities during the combustion of toluene were evaluated.The structure and physico-chemical properties of the perovskites were characterized by X-ray diffraction,Fourier transform infrared spectroscopy,scanning electron microscopy,and BET surface area analyses.The compounds were crystallized as a perovskite phase with an orthorhombic structure.The mean particle size of the perovskites increased with an increase in europium loading while the specific surface area decreased.Characterization data confirmed that a total insertion of Eu into LaFeO3 occurred at x ≤ 0.15.However,Eu2O3 segregation occurred to some extent especially at x ＞0.15.The catalytic activity of the catalysts increased substantially with an increase in Eu substitution in the evaluated range.